<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<form action="test" method="post">
    <input type="text" name="nikiName">
     <!--隐藏表单域-->
    <input type="hidden" name="username" value="lijuhua">
     <button type="submit">发送</button>
</form>

</body>
</html>